MR imaging features of bizarre parosteal osteochondromatous proliferation of bone (Nora's lesion)

Torreggiani, William C; Munk, Peter L; Al-Ismail, Khalid; O'Connell, John X; Nicolaou, Savvas; Lee, Mark J; Masri, Bassam A

« Previous Next »European Journal of Radiology
Volume 40, Issue 3 , Pages 224-231, December 2001

MR imaging features of bizarre parosteal osteochondromatous proliferation of bone (Nora's lesion)

William C Torreggiani
- Department of Radiology, Vancouver General Hospital, University of British Columbia, 899 West 12th Avenue, Vancouver, BC, Canada V5Z 1M9
Peter L Munk
- Department of Radiology, Vancouver General Hospital, University of British Columbia, 899 West 12th Avenue, Vancouver, BC, Canada V5Z 1M9
- Corresponding author. Tel.: +1-604-875-4533; fax: +1-604-875-4723
Khalid Al-Ismail
- Department of Radiology, Vancouver General Hospital, University of British Columbia, 899 West 12th Avenue, Vancouver, BC, Canada V5Z 1M9
John X O'Connell
- Department of Pathology, Vancouver General Hospital, University of British Columbia, 899 West 12th Avenue, Vancouver, BC, Canada V5Z 1M9
Savvas Nicolaou
- Department of Radiology, Vancouver General Hospital, University of British Columbia, 899 West 12th Avenue, Vancouver, BC, Canada V5Z 1M9
Mark J Lee
- Department of Radiology, Vancouver General Hospital, University of British Columbia, 899 West 12th Avenue, Vancouver, BC, Canada V5Z 1M9
Bassam A Masri
- Department of Orthopaedics, Vancouver General Hospital, University of British Columbia, 899 West 12th Avenue, Vancouver, BC, Canada V5Z 1M9

Received 15 January 2001; received in revised form 28 May 2001; accepted 30 May 2001.

Abstract

The purpose of this study was to review the imaging findings of three patients with bizarre parosteal osteochrondromatous proliferation of bone (BPOP). The plain radiographs and MRI images of three patients with BPOP were obtained and retrospectively reviewed. In two cases, BPOP involved the feet. In one case BPOP involved the hand. In all three cases, plain radiographs showed a well-defined calcium containing mass adjacent to the cortical surface of the adjacent bone. The underlying bone appeared normal in all cases. On MRI, the lesion was of low signal intensity on T1 weighted sequences in all cases. On FSE T2 weighted and STIR sequences, the lesion was of high signal in all cases. The cortex, medullary cavity and adjacent soft tissues appeared normal in all cases. While BPOP is rare and often confused with a variety of both benign and malignant lesions, there are specific radiological findings that may help to distinguish BPOP from many of its mimickers.

Keywords: Bizarre parosteal osteochrondromatous proliferation of bone, BPOP, Nora's lesion, MRI, Imaging